Enron doesn't exactly have a good reputation, but some of the criticism seems a bit unreasonable. The renewable energy certificates sound rather like our renewable obligation certificates. Renewable energy producers are allowed to sell their certificates to other energy suppliers who are unable to produce the required amount of energy by renewable means. It's a way of supporting a renewable industry until it is able to compete with the established energy companies. It's not exactly unusual for any business to want to make money.
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